Research on Construction Safety Risk Assessment of New Subway Station Close-Attached Undercrossing the Existing Operating Station

Table 1

Preliminary risk factors of the new subway station close-attached undercrossing the existing station.

First-level index	Second-level index
A Existing subway station	A1 Station structure
	A2 Track structure
	A3 Power supply system
	A4 Water supply and drainage system
	A5 Ventilation and signal system
B New subway station	B1 Construction monitoring of existing station
	B2 New space enclosing structure
	B3 Engineering dewatering
	B4 Foundation pit excavation
	B5 Surrounding rock and soil mass and surrounding environment
	B6 Construction technology management of main structure
	B7 Green construction